Malicious PDF — malware analysis report

Static analysis result for SHA-256 a659aafba9878d4a…

MALICIOUS

PDF

42.5 KB Created: 2020-09-08 07:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1385c99446e76e65fbe7097e0f4aa7ac SHA-1: 2cc229f6659aa47de9e852056323915fa4cc7c9f SHA-256: a659aafba9878d4a847cb9a79f8d113b61be9f6b53f8bae2db33182ebd90930c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing 'Kansas city chiefs injury report week 14' and a URL that appears to be a lure. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is identified as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/pify?keyword=kansas+city+chiefs+injury+report+week+14
    • https://static.usrfiles.com/ugd/99965f_bc9690190f4041a5ad00626faabf02ee.pdf
    • https://static.usrfiles.com/ugd/77941b_db2462286ab04614a6827480ccd4e153.pdf
    • https://static.usrfiles.com/ugd/b58d21_e7858fbd8ac64dfa8caf7e8b680c6da8.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b2042b482faf467583313440c04f05a6.pdf
    • https://static.usrfiles.com/ugd/c068f8_6464f387aa20420d8c413915f3a204bd.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/30718679368.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/pesowe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/folovuwokafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/87077083734.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/moneyskill_answers_module_15.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/monanivizoxifun.pdf
    • https://static.usrfiles.com/ugd/baa514_819cf39d564642ffa652412379d0e48a.pdf
    • https://static.usrfiles.com/ugd/97634b_0287e0846dba4a848f1d22a1a1bb0040.pdf
    • https://static.usrfiles.com/ugd/370ea2_96e75ea9b54541ddb96bd6ce9c91de23.pdf
    • https://static.usrfiles.com/ugd/9aab09_c86c1c9e9df041d4a2a8a089123d0ee4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a7.bin
9ef4c5837dd1d402d7250336632f4b9e509077798a150c4afa6d317384548637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 5512 bytes
font_01_sfnt_off0000798e.bin
7e33269693ae2076d58431ef8bd651e1fe4bfa1957ce6c254c2f55ab93f32e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 10432 bytes

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